DigitalFlow™ GS868 Service Manual 19
Chapter 2. Error Codes and Screen Messages
2.6 E4: Signal Quality
Problem: The signal quality is outside the limits programmed in the SETUP submenu of the User Program.
Cause: The peak of the upstream or downstream correlation signals has fallen below the correlation peak limit, as
set in the
SIGNL submenu. This may be caused by a flowcell or electrical problem.
Action: Check for sources of electrical interference and verify the integrity of the electronics console by
temporarily substituting a test flowcell that is known to be good. Check the transducers and relocate them,
if necessary. See Chapter 3, Diagnostics, for instructions.
2.7 E5: Amplitude Error
Problem: The signal amplitude exceeds the limits programmed in the SETUP submenu of the User Program.
Cause: Excessive levels of an attenuating gas, such as CO
2
, are present in the flowcell. Solid or liquid particulates
may be present in the flowcell.
Action: Refer to Chapter 3, Diagnostics, to correct any flowcell problems.
2.8 E6: Cycle Skip, Accel.
Problem: The acceleration exceeds the limits programmed in the SETUP submenu of the User Program.
Cause: This condition is usually caused by poor flow conditions or improper transducer alignment.
Action: Refer to Chapter 3, Diagnostics, to correct any flowcell and/or transducer problems.
2.9 E7: Analog Out Error
Problem: The current in the analog output circuit exceeds the limits for the analog output port.
Cause: The output load exceeds the specified limits for the analog output port.
Action: Make sure the output load is <550 ohms for the Slot 0 analog outputs or is <1000 ohms for an analog
outputs option card.
2.10 E8: Temp In
Problem: This message indicates a temperature input error.
Cause: The temperature exceeds the specified limits for the analog inputs option card or no input device is
connected.
Action: Check the temperature transmitter and the connecting cable. Refer to Chapter 1, Calibration, and
recalibrate the analog inputs on the option card.
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